Many American police officers, before speaking to stopped motorists, approach the car from behind and gently, barely noticeable, touch the headlight or body with one hand. Sometimes they apply only one index finger, in other cases the law enforcement officer leans the entire palm. This practice is absolutely incomprehensible and not obvious to our drivers and policemen. So why do they do this in America?
The work of a police officer in the United States, on average, is associated with slightly more stress than the work of a law enforcement officer in any other country in the world. And it's not about some special criminality of the situation. First of all, this is due to the free carrying of short-barreled weapons. In America, a policeman must always be prepared for two things: that he will be shot, and that he will have to put up armed resistance. In other words, the work is both dangerous and extremely nervous.
The practice of touching the body of a car with the palm or finger is directly related to these risks. This is done in order to leave your fingerprints on the vehicle. In this case, even if something happens to the policeman, it will be much easier for his colleagues in the future associate this car and the identity of the owner with a specific incident and act of violence against the guard law. This practice appeared at the beginning of the 20th century and was used until the beginning of the 21st.
Some police officers leave fingerprints on every car today, but this practice is gradually fading away. There are no more strict instructions to do this from the authorities and for safety reasons. First of all, because of the ubiquity of video equipment. Today, cameras hang not only on every corner, but more importantly, they are worn right on the chest of law enforcement officers. However, some American police officers continue to leave prints out of habit.
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A source: https://novate.ru/blogs/151221/61563/